Comparative Analysis of Screw Loosening With Prefabricated Abutments and Customized CAD/CAM Abutments

Paek, Janghyun; Woo, Yi-Hyung; Kim, Hyeong-Seob; Pae, Ahran; Noh, Kwantae; Lee, Hyeonjong; Kwon, Kung‐Rock

doi:10.1097/id.0000000000000481

Cited by 17 publications

(31 citation statements)

References 18 publications

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“…Tzannas et al [26] reported that the removal torque is 85 up to 90% of tightening torque. However, Paek et al [14] reported that there was no significant difference among initial tightening torque first or second removal torque. Their results may be attributed to the employment of two different devices for screw tightening in their study.…”

Section: Discussionmentioning

confidence: 97%

“…A study examined the stability of implant protheses with stock abutment, cast gold abutment, and milled custom abutment, and reported that the type of the abutment did not possess a significant influence on screw loosening after dynamic loading [13]. Another study showed good screw joint stability for stock and custom titanium abutments after cyclic loading [14].…”

Section: Introductionmentioning

confidence: 99%

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Hybrid-abutment-restoration: effect of material type on torque maintenance and fracture resistance after thermal aging

2020

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Purpose: To evaluate the tightening torque maintenance with zirconia, lithium disilicate, and polyetheretherketone (PEEK) hybrid-abutment-crowns after thermal aging, in addition to assess the fracture resistance of hybridabutment-crowns fabricated with different materials. Materials and methods: Thirty implants were restored with identical hybrid-abutment-crowns, resembling the maxillary first premolar, fabricated from zirconia (Zr), lithium disilicate (L2), or ceramic-reinforced PEEK (PE). The three groups (n = 10) were constructed utilizing a Ti-base. After bonding, each restoration was secured in its respective implant with a torque of 25 Ncm. All restorations were subjected to thermal aging for 7000 cycles. The loosening torque was assessed utilizing the digital torque meter. Each restoration was subjected to fracture testing and the mode of failure was determined. Results: Zr group displayed the highest mean torque loss value (2.70 ± 0.59 Ncm) with the mean loosening torque value of 22.38 ± 0.68 Ncm. PE group displayed the lowest mean torque loss (2.55 ± 0.50 Ncm) with mean loosening torque value of 22.61 ± 0.59 Ncm. There was no significant difference between study groups regarding loosening torque (p = 0.68), torque loss (p = 0.80), and percentage of torque loss (p = 0.79). There was significant difference regarding the mean fracture load value between Zr and PE groups. However, there was no significant difference (p = 0.05) regarding mean fracture load value between L2 and PE groups. Conclusion: The hybrid-abutment-crown material does not affect the torque maintenance after thermal aging. Based on fracture load, zirconia hybrid-abutment-crown can be used, while lithium disilicate and PEEK hybridabutment-crowns may cautiously serve in premolar region.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Hybrid-abutment-restoration: effect of material type on torque maintenance and fracture resistance after thermal aging

2020

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“…CAD/CAM abutments seem to achieve adequate stability in the screw joint and offer a viable treatment option for single tooth implants . Kim et al suggested that, even though there are no significant differences on short‐term screw loosening between CAD/CAM abutments and prefabricated or gold cast abutments, CAD/CAM custom abutments may present higher incidence of screw loosening than the other abutments after dynamic loading .…”

Section: Discussionmentioning

confidence: 99%

“…Currently, metal abutments are most often used, although the zirconia prosthetic abutments of high strength can be considered as an equally favorable option in clinical practice, [45][46][47][48] On the other hand, Cavusoglu et al suggested that the interface of zirconium abutment and titanium implants may be susceptible to wear of the abutment and deformation of the implant neck. 49 CAD/CAM abutments seem to achieve adequate stability in the screw joint 50 and offer a viable treatment option for single tooth implants. 51 Kim et al suggested that, even though there are no significant differences on short-term screw loosening between CAD/CAM abutments and prefabricated or gold cast abutments, CAD/CAM custom abutments may present higher incidence of screw loosening than the other abutments after dynamic loading.…”

Section: Materials Of the Prosthetic Abutmentmentioning

confidence: 99%

Loosening of the fixing screw in single implant crowns: predisposing factors, prevention and treatment options

Kourtis

Damanaki

Kaitatzidou

et al. 2017

J Esthet Restor Dent

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The problem of technical complications in implants and implant-supported restorations has existed for decades. The most frequent complication is the loosening of the fixing screw which, although is not catastrophic, if it occurs repeatedly, it may affect the success of the implant therapy and the patient satisfaction. Factors that affect the frequency of prosthetic complications include: the implant-abutment connection, para-functional habits, cantilevers and the type of restoration. The treatment options for the clinician are limited but certain preventing measures during construction of the restoration may be helpful to overcome this clinical problem.

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“…Many studies have been performed to overcome these complications through a series of stress analyses, including a finite element analysis (FEA). 7 8 9 10 11 12 13 14 15 16 17 18 19 20 …”

Section: Introductionmentioning

confidence: 99%

Biomechanical stress and microgap analysis of bone-level and tissue-level implant abutment structure according to the five different directions of occlusal loads

et al. 2020

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PURPOSE The stress distribution and microgap formation on an implant abutment structure was evaluated to determine the relationship between the direction of the load and the stress value. MATERIALS AND METHODS Two types of three-dimensional models for the mandibular first molar were designed: bone-level implant and tissue-level implant. Each group consisted of an implant, surrounding bone, abutment, screw, and crown. Static finite element analysis was simulated through 200 N of occlusal load and preload at five different load directions: 0, 15, 30, 45, and 60°. The von Mises stress of the abutment and implant was evaluated. Microgap formation on the implant-abutment interface was also analyzed. RESULTS The stress values in the implant were as follows: 525, 322, 561, 778, and 1150 MPa in a bone level implant, and 254, 182, 259, 364, and 436 MPa in a tissue level implant at a load direction of 0, 15, 30, 45, and 60°, respectively. For microgap formation between the implant and abutment interface, three to seven-micron gaps were observed in the bone level implant under a load at 45 and 60°. In contrast, a three-micron gap was observed in the tissue level implant under a load at only 60°. CONCLUSION The mean stress of bone-level implant showed 2.2 times higher than that of tissue-level implant. When considering the loading point of occlusal surface and the direction of load, higher stress was noted when the vector was from the center of rotation in the implant prostheses.

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Comparative Analysis of Screw Loosening With Prefabricated Abutments and Customized CAD/CAM Abutments

Abstract: With precise control of CAD/CAM abutments, good screw joint stability can be achieved.

Cited by 17 publications

References 18 publications

Hybrid-abutment-restoration: effect of material type on torque maintenance and fracture resistance after thermal aging

Hybrid-abutment-restoration: effect of material type on torque maintenance and fracture resistance after thermal aging

Loosening of the fixing screw in single implant crowns: predisposing factors, prevention and treatment options

Biomechanical stress and microgap analysis of bone-level and tissue-level implant abutment structure according to the five different directions of occlusal loads

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